"But this time the Aura HD was simply left in the sun for a while and when my wife came back, the screen was covered with lines. Nobody had been around it."
My only problem with statements like the above is, if no one was around it, how do you know no one/nothing was around it?
Considering that people have alluded to the possibility that their cats or other pets stepping/landing on the screen may have broken it, it obviously doesn't necessarily require a human presence to deliver enough force in a small enough area to cause damage directly to the screen.(damned pelicans and flying monkeys!) Further, from the look of the image posted, there are multiple stress cracks parallel to the same diagonal which does make one wonder...
Frankly, an hour or so in the sun on a fairly sunny day could easily exceed the unpowered storage specs for the device, so who is to say? Flat black plastic absorbs a lot of solar radiation.
I try to keep all my devices in cases and cool when they aren't in my hot, not so little, hands. Five or six years ago, on a fairly warm spring day travelling on an interstate facing head on into the sun, I was running Google Maps on a cell phone in a windshield mount -the phone got so warm between charging and being in the sun that I had to roll the window down and hold it outside at 55-60mph for a bit periodically to cool it. The phone was jet black and admittedly always got a little warm charging, but in this case was hot enough that the charging cycle was being interrupted.
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